adjective, foolhardier, foolhardiest.
recklessly or thoughtlessly bold; foolishly rash or venturesome.

1175–1225; Middle English folhardy < Old French fol hardi. See fool1, hardy

foolhardily, adverb
foolhardiness, noun

impetuous, headlong, heedless, incautious. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
foolhardy (ˈfuːlˌhɑːdɪ)
adj , -hardier, -hardiest
heedlessly rash or adventurous
[C13: from Old French fol hardi, from fol foolish + hardi bold]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

early 13c., from fool (n.) + M.E. hardi "bold;" hence "foolishly brave."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
To keep fully on top of this onslaught is both difficult and foolhardy.
It seems foolhardy to expect, or even want, all faculty to jump through the
  exact same hoops in order to prove themselves worthy.
One thick-skinned show-off waves his foot in the flames for a foolhardy second.
Nevertheless, ignoring the danger would be foolhardy.
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